(T-Mo deal expires March 6, Amazon deal ongoing)
You can get 1000 minutes per month for $39.99 with T-Mobile and get paid $100 to buy the Blackberry Pearl (through Amazon.com, after $100 in rebates).
For a limited time (until next week, I believe), T-Mobile is offering 1000 whenever minutes for $39.99 per month (includes free nights/weekends). Normally they only offer 600 minutes at this price, or 1000 minutes with no free nights/weekends. T-Mobile usually has the best $/min rates, and they are known for overspending on customer service (you can talk to a human, and even one that speaks English). Downside is not as many cell towers as other carriers, so coverage can be spottier.
I got this phone last week and I love it, thanks!! T-mobile customer service is awesome--super friendly, professional, and patient. Love the phone and the service so far. Even ported my previous number from Sprint. Set-up was a breeze, even for the technology-challenged like me. :)